Wire-drawing die



(No Model.)

H M. BLAKE. WIRE DRAWING DIE.

No. 326,097. Patented Sept. 15, l885.

N PETERS. PMo-Uihognphqr, Washington DvC.

NITED STATES PATENT @rrrca.

FRANCIS M. BLAKE, OF WORCESTER, MASSACHUSETTS.

WIRE- DRAWlNG DIE.

SPECIFICATION forming part of Letters Patent No. 326,097 dated September15, 1385.

Application filed August 1, 1884. (No model.) i

T at whom it may concern.-

Be it known that I, FRANCIS M. BLAKE, a

citizen of the United States, residing at Worthe adjustable die incylindrical form, and

Fig. shows the die with conical or tapering sides.

Similar letters refer to similar parts in the several views.

My invention has forits object to provide an adjustable die forwire-drawing which will permit the size of the die to be varied tocornpensate for the enlargementincident to its use, and thereby maintaina uniform size of the wire; and my invention consists in forming the dieof a spiral coil of wire having an internal diameter equal to thedesired diameter of the wire, and by a pressure applied radially to itsouter surface to contract the coil and reduce the internal diameter asit becomes worn away by use; and my invention further consists in theconstruction andarrangement of the several parts, as hereinafter setforth.

A represents a metallic block having a screw threaded chamber, B, toreceive the screw D, through which a hole, F, passes, tapered or flaringat its inner end at G.

O is a conical follower held in the block A concentrically with thechamber B and the ta pered hole G. Through the conical follower O is ahole, E, coincident wit-h the hole F through the screw D.

In the tapered hole G, I place a spiral coil, H, of rectangular wire,its outer surface fitting the tapered hole G, and its internal diameteror bore equal to the desired diameter of the wire, the coil forming ahollow conoidal frustum heldin the tapered opening G in the screw D,with its base resting against the end of the follower .O. The length ofthe tapered hole' G should be greater than that of the spiral coil, soas to allow the screw D to be screwed into the block A and the coilforced into the hole, as shown in Fig. 2.

In use the wire rod is made to pass through the die in the direction ofthe arrow in Fig. 1, being drawn through the spiral coil H, whoseinternal diameter is slightly smaller than the wire rod, and leaving thedie or coil through the opening E in the follower 0. As the hole in thespiral coil H becomes enlarged, the screw D, carrying the coil, isscrewed into the block A,pressing the coil against the conical followerO, and forcing it farther into the tapered opening G in the screw D,thereby contracting the coil and reducing its internal diameter, so asto maintain with accuracy the size of the wire as drawn. This may berepeated as often as the wear upon the die'shall require,until thespiral coil shall have been forced the entire length of the taperedopening G in the screw D, as shown in Fig. 2, when the coil may bereplaced by one filling the larger end of the tapered opening. as shownin Fig. 1, and the operation repeated. The adjustment of the die mayalso be employed to vary the size of the wire within certain limits.

The spiral coils are easily and cheaply made by winding a strip ofrectangular steel wire upon an arbor,forming a coil of uniform size, asshown at I in Fig. 3 and in end view in Fig. 4.; and the conical shapemay be given, as shown in Fig. 5, by inserting the end of the coil I inthe larger end of a tapering or conical chamber and forcing the coilinto the chamber, pressing it into a corresponding shape in the samemanner as the coil is forced into the chamber G in the operation ofadjusting the die.

I do not confine myself to the specific method shown of effecting theadjustment of the die, as other and equivalent modes of accomplishingthe same result may be employedas, for instance, the follower C may beomitted and the spiral coil H be made large enough, so the smaller endwill only enter the opening G a short distance, the larger end of thecoil projecting beyond the end of the screw and resting against thebottom of the chamber B, the action of the screw forcing the coil intothe chamber, and causing the die to be contracted in the same manner ashas already been described; or the spiral coil may be held in a taperingchamber in the block A, and a conical follower fitting said chamber,similar to the follower C, may be provided with a screwthread, by whichit may be forced into the tapering chamber, driving the spiral coilbefore it and efiecting the contraction of its diameter; or acylindrical coil, I, Figs. 3 and 4, may be used, and a pressure appliedradially of sufficient force to contract the coil, the essential featureof the first part of my invention consisting in a Wire die in the formof a spiral coil capable of contraction by means of radial pressure uponits outer surface.

' Having described the several features con,-

stituting my invention, What I claim, and de sire to secure by LettersPatent, is-

1. An adjustable die for drawing wire, consisting of a spiral coilhaving connected means for applying radial pressure to its outersurface, whereby it may be contracted and its intcrnal diameter or borereduced to compensate for wear or to Vary the size of the wire, as andfor the purpose set forth.

2. An adjustable die for drawing Wire, consisting of a conical spiralcoil with an internal bore, through which the wire rod is drawn, saidspiral coil being held in a tapering chamber, and having connected meansfor sliding the coil endwise in said chamber, whereby the diameter ofthe coil may be reduced, combined and operating as described, as and forthe purpose set forth.

3. In an adjustable die for drawing wire, the combination of blockA,having ascrew-threaded chamber, B, hollow conical follower O, screw D,with hole F and tapered section G, and spiral coil H,he1d in saidtapered section, as and for the purpose set forth.

FRANCIS M. BLAKE.

Vitnesses:

RUFUs B. FOWLER, EDWARD R. WVHITE.

